def post_attachment(pid, name):
'''
Given a post ID and file name, retrieve the post, find the matching
attachment, and return the relevant file.
:param pid: the post ID.
:param name: the attachment name.
'''
attachment = get_attachment('name', name, {'_id': pid})
digest = attachment['digest']
return send_from_directory(get_attachment_dir(digest), digest,
mimetype=attachment['content_type'])
def attachment(digest):
'''
Given an attachment digest, find a post that lists the digest in its
`attachments` array and return the relevant file.
:param digest: the attachment digest.
'''
lookup = {
'attachments': {
'$elemMatch': {
'digest': digest
}
}
}
attachment = get_attachment('digest', digest, lookup)
return send_from_directory(get_attachment_dir(digest), digest,
mimetype=attachment['content_type'])
